Future of the ECB’s bond-buying program is one of the biggest questions hanging over global markets

FRANKFURT—European Central Bank President Mario Draghi is scheduled to address the Federal Reserve’s Jackson Hole conference in August for the first time in three years, according to a person familiar with the matter, in a speech that is expected to give a further sign of the ECB’s growing confidence in the eurozone economy and its reduced dependence on monetary stimulus.

The future of the ECB’s €60 billion-a-month ($68.5 billion) bond-buying program, which is currently due to run through December, is one of the biggest questions...